#include<stdio.h>
typedef enum
  {
    YES,
    NO
  }BOOL;

typedef enum
  {
    ATOM,
    SEXPR
  }ExprType;

typedef enum
  {
    
  }TokenType;

typedef struct token
{
  char name[40];
  
}Token;

typedef struct
{
  ExprType expressionType;
  
}ExprLink;

bool IsLetter();
bool IsDigital();
void NextToken();

int main() 
{ 
  FILE *fp;
  const char *fileName = "in.txt";
  //"D:\\workspace\\c\\my-lib\\algorithm\\Introduction_to_Algorithms_Second_Edition\\GetSymbols\\GetSymbols.cpp";
  fp = fopen(fileName,"r");
  int i=0;
  char c;
  char charToString[2];
  //freopen("in.txt","r",stdin); 
  freopen("out.txt","w",stdout);

  

  return 0; 
}


BOOL IsLetter(char c)
{
  if((c >= 'a' && c <= 'z')
     ||(c >= 'A' && c <= 'Z')
     )
    {
      return YES;
    }
  return NO;
}

BOOL IsDigital(char c)
{
  if(c >= '0' && c <= '9')
    {
      return YES;
    }
  return NO;
}
